Nonslipping wrench



June 17, 1930. J. B. SCHULTZ NONSLTPPING WRENCH' Filed May 9, 1929 I Inveniof Attorney Patented June 17, 1930 was Joseph B. scncrrrz, or crnvnmmn; on o- NONSLIIPPING: WRENCH 1 Application filed May 9, 1929 Serial No. 361,621. 7

This invention relates to Wrenches and more particularly to wrenches utilized in adjusting tappet valve stems, on internal combustion engines. I

An object of the invention is to provide a wrench that when circumposed about a nut or bolt head that will not slip from the same regardless of the movement of the nut.

Further objects of the invention are to pro vide, in a manner as hereinafter set forth a Wrench of the character referred to,.which is very simple in its fabrication, thoroughly reliable for its intended purpose, strong, durable, and compact, and comparatively inexpensive to manufacture and install.

With the foregoing and other objects in,

view, the invention consists in the novel construction, combination and arrangement of parts as will be hereinafter more specifically described and illustrated in the accompanying drawings, wherein is disclosed an embodiment of the invention, but it is to be understood that changes, variations and modifications may be resorted to, without'departing from the spirit of the claim hereunto appended. In the drawmgs, wherein llke reference characters 7 denote corresponding parts throughout the several views:

Figure 1 is a detailed fragmentary section of an internal combustion engine in the region of the tappet valve stem and illustrating an adaptation therewith of the device in accordance with this invention.

Figure 2 is a top plan view thereof,

Figure 3 is an outer end view thereof, and

Figure 4 is a fragmentary plan, partly in section, of one end thereof. 7

Referring to the drawings in detail, 5 indicates a cylinder wall of an internal combustion engine having a tappet valve stem 6 extending therethrough. One of the well 1 known types of tappet valve construction, the

valve stem 6 is formed with a socket 7 at the outer end thereof, in which is threadably engaged a threaded bolt or stud screw 8. A pair of lock nuts 9, 10, are mounted on the intermediate portion of the stud screw 8, in abutting relation to the inner shoulder of the valve stem 6. The outer end of the bolt 8 is formed with a head 11, whichengages with the push rod (not shown in the drawings) by which the tappet valve is operated in cooperation with the firingof the internal combustion engine; i

In the course of use, the valve becomes worn or may become elongated for many reasons,thereby preventing the valve from seating properly. It therefore becomes necessary, from time to time, to adjust the valve,

so'tha't loss'of compression may be remedied.

To adjust the valve stem the better practice to move the stem whiletheengine is in operation, so as to have a practical trial of the adjustment during the setting of the stem.

To adjust the stem, the pair of lock nuts 1 9 may be materially loosened before the engine has started running and afterthe engine has begun running the wrench indicated 7 generally at 12 and formed in accordance with this invention is placed on the head 11 of the adjusting bolt 8 and by reason of'the present invention the head of the wrench will not become detached fromthe nut 8, during the'oscillation of the valve stem 6.

The wrench in accordance wit-h this invention is formed of an elongated plate-like body portion 13 having heads 15, 16, formed on its opposite ends and one of which 16, to be specific, is offset with respect to the longitudinal median of the body portion 13. The head 16 is offset at'an angle of approximately 80 so as to provide for close work. Each of the heads are formed withrecesses 17, 18, which extend from their outer edges inwardly for a portion of the width or diameter of the head. Each of the recesses 17, 18, are formed in a like manner, andit is believed that a description of one'will suffice for an understand ing of both.

The recesses are formed with a pair of side walls 19, 20, merging at their inner ends with the inner arcuate wall 21 and the guide walls 19, 20 are parallel and of less width than the thickness of the heads of the wrench.

A11 inwardly directed pair of flanges 22, 23, are formedvintegral with the sides 'and'end walls of the recesses and extend at right angles thereto.

The edges of the recessed walls merge with the flanges 22, 23, and the outer faces of the flanges are fiush with the opposite faces of the heads 15, 16, thereby providing a channel the flanges of which form abutments to prevent the nut or bolt heads from slipping out of the recesses, while the same is moving upwardly or downwardly.

Y The side and end walls of the recesses 17, 18

may be as desired, but since the conventional adjusting bolt 8 is of standard size, the

wrench recess walls may be adapted to conventional types or may be formed of a width as desired to meet all emergencies;

After the bolt 8 has been adjusted so as .to make a tight seat for the Valve, any type of wrench may be used forlocking the lock nuts 9 and .10 against the inner shoulder of the valve stem 6.

What is claimed is: V

Ina wrench, an elongated body portion having a head at the end thereof, said head formed with a recess opening inwardly and longitudinally of the body portion, inwardly directed flanges formed on the opposite edges ofthe recessed wall and co-extensive therewith to overlap the sides of the nut when the nut is seated in the recess.

' Intestimony whereof I afliX my signature.

JOSEPH B. SCHULTZ. 

